This comes up kinda flat to me (yea, I know, "Well, duh, it's a shadow"), but it may have been more interesting with some different colors. Maybe? Like a pale blue wall, or a greenish tint to the whole thing.
I know the soft focus is there on purpose but I wish it wasn't. Can you tell me how many light sources you used and why the soft focus. Still high on my list. I can't deduct because it doesn't satisfy my needs.
Great, another photo that makes the shadow its main focus - surprisingly, there are not many of them. I like the pose. Also just played around with your photo in some editing software, I think it would've been much more striking if you had played with the contrast and gamma a bit to create more of a black & white, rather than gray & gray image.
Interesting idea. not doing a lot for me though. might be good in a minimalistic way. I'd be interested in seeing if a sharper shadow would make this look any more interesting.
In this case I think the lack of definition in the shadow edges works to your advantage. However, the collar and bulk of the clothing on the model works against you.